bpftool: make libbfd optional

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Make it possible to build bpftool without libbfd. libbfd and libopcodes are
typically provided in dev/dbg packages (binutils-dev in debian) which we
usually don't have installed on the fleet machines and we'd like a way to have
bpftool version that works without installing any additional packages.
This excludes support for disassembling jit-ted code and prints an error if
the user tries to use these features.

Tested by:
cat > FEATURES_DUMP.bpftool <<EOF
feature-libbfd=0
feature-disassembler-four-args=1
feature-reallocarray=0
feature-libelf=1
feature-libelf-mmap=1
feature-bpf=1
EOF
FEATURES_DUMP=$PWD/FEATURES_DUMP.bpftool make
ldd bpftool | grep libbfd

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

...

This commit is contained in:

Stanislav Fomichev 2018-11-12 13:44:10 -08:00 • committed by Alexei Starovoitov

parent ae9435f696

commit 29a9c10e41

5 changed files with 35 additions and 6 deletions

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13

tools/bpf/bpftool/Makefile

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8

tools/bpf/bpftool/jit_disasm.c

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3

tools/bpf/bpftool/main.c

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14

tools/bpf/bpftool/main.h

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3

tools/bpf/bpftool/prog.c

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